Question

Assertion (A): The brown colour of bromine fades when it is added to ethylene.

Reason (R): Ethylene shows substitution reactions.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(3)

Explanation:

The brown colour of bromine fades when it is added to ethylene because ethylene undergoes an addition reaction with bromine. Therefore, the Assertion (A) is true.

Ethylene does not mainly undergo substitution reactions; it undergoes addition reactions because it has a C = C double bond. Therefore, the Reason (R) is false.

Hence, A is true but R is false.